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The quantum yield of singlet oxygen (a1^), produced by energy transfer from the photosensitizer acridine, has been determined by two independent spectroscopic methods in solid polystyrene. Upon 355-nm pulsed-laser irradiation of acridine at 1.3 mJ/pulse, the OzCa1^,) quantum yield in polystyrene [0Aps(acridine) = 0.56 ± 0.05] is slightly smaller than that in a liquid solvent analog such as benzene [0Abera(acridine) = 0.83 ± 0.06]. These data indicate that the photosensitized yields of Oa^A,) in a solid polymer matrix can nevertheless be appreciable, which may be important for understanding the photodegradation of some polymeric materials or of dyes and other additives dissolved in those materials.